Star Wars: What I watched the most was a cruddy old VHS recording off one of the first network broadcasts. Some stuff was cut, and also my dad was slow on resuming the recording after commercials. My bro and I watched that tape a ton, maybe not 100 times but close. I wish I could find it again for nostalgia.
Empire Strikes Back: Never recorded this one from TV, so didn't watch this too much until the 1992 VHS. More recently been going with the 2004 DVD.
Return of the Jedi: Mostly an old VHS recording of the network broadcast premiere. One cool thing from that was the trailer they put together before the movie started. Short Star Wars theme with some neat clips, especially when they had Han giving Lando a salute before getting on the shuttle, then Lando returning the salute, then Luke giving R2 a salute on Jabba's barge. Cool little montage. :) I wish I could find that tape too. Anyhow, later I got the laserdisc which was a nice upgrade from the 1992 VHS.